Organization and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Interest costs capitalized	$ 126,000	$ 828,000
Amortization of above and below market leases	228,000	698,000
Revolving credit facility borrowing capacity	900,000,000
Mortgages
Debt Instrument [Line Items]
Debt costs	147,000			$ 147,000
Debt costs accumulated amortization	77,000			73,000
Notes Payable to Banks
Debt Instrument [Line Items]
Debt costs	26,932,000
Debt costs accumulated amortization	7,256,000			$ 6,705,000
In-place leases, net
Debt Instrument [Line Items]
Acquired-in-place leases	$ 2,244,000	$ 3,146,000
ASC 842
Debt Instrument [Line Items]
Operating lease – ROU assets			$ 7,735,000
Operating lease – lease liabilities			$ 10,155,000